No, you can just install a 200 amp service with your existing wiring. But, you need to make sure the wiring is safe and not deteriorated to the point it has become dangerous.
If you are contemplating an electrical upgrade the 70 to 100 jump is not justified. Presuming that you are going to get a qualified electrical contractor to do the installation along with the proper permits, go to a 200 amp panel. Your labour costs are going to be the same no matter what size panel you get installed. The only difference in costs will be the materials. Go for a 200 amp 42 circuit distribution panel. It will increase your resale value of the house should you decide to sell in the future.
If you are talking about a breaker in a house panel then a 15 amp breaker would be used. It is the smallest amperage breaker that you will find in a house panel.
180 amps. Assuming the panel will be loaded only 80%.
There's more to it than just adding some larger wire. You must upgrade your meter, your weatherhead, conduit, etc. Your power company will handle the cable from the pole to your meter. After that...its up to you. 4/0 aluminum or 2/0 copper SE or USE from the meter to panel. This change has to go all the way back to the main power transformer. It's illegal to do this yourself and the power company will not turn your power back on of you do. Call an electrician.
The size of the sub panel is dependant on the amount of connected loads and the amperage of these loads, or the total load in amps on how many new circuits that you will require.
If you are contemplating an electrical upgrade the 70 to 100 jump is not justified. Presuming that you are going to get a qualified electrical contractor to do the installation along with the proper permits, go to a 200 amp panel. Your labour costs are going to be the same no matter what size panel you get installed. The only difference in costs will be the materials. Go for a 200 amp 42 circuit distribution panel. It will increase your resale value of the house should you decide to sell in the future.
If you are talking about a breaker in a house panel then a 15 amp breaker would be used. It is the smallest amperage breaker that you will find in a house panel.
180 amps. Assuming the panel will be loaded only 80%.
There's more to it than just adding some larger wire. You must upgrade your meter, your weatherhead, conduit, etc. Your power company will handle the cable from the pole to your meter. After that...its up to you. 4/0 aluminum or 2/0 copper SE or USE from the meter to panel. This change has to go all the way back to the main power transformer. It's illegal to do this yourself and the power company will not turn your power back on of you do. Call an electrician.
The size of the sub panel is dependant on the amount of connected loads and the amperage of these loads, or the total load in amps on how many new circuits that you will require.
I doubt if you can fit a 200 amp breaker into a 100 amp panel and it is illegal as the bus bars in a 100 amp panel are rated at 100 not 200 amps. The panel must be of the same capacity in amps as the main breaker that is installed in it. You can go smaller but not larger. The other problem is that a 200 amp service required three ought (000) wire. 000 copper wire with an insulation factor 90 degrees C is rated at 210 amps. Two ought (00) copper wire with an insulation factor of 60C is rated at 145 amps, 75C is rated at 175 amps and 90C is rated at 185 amps. Buy a complete house package that has the main breaker and all of the appliance breakers plus a few breakers for 15 amp circuits, all for one price that is cheaper that buying individual pieces.
A balanced house panel should be the ultimate goal. It will not save you electricity as the watt meter on the house monitors the use of power from both legs of the incoming power. To balance a panel you want the current from L1 to Neutral to equal L2 to Neutral. The neutral carries the unbalanced current between L1 and L2. A perfectly balanced panel will have no current on the neutral. It is done by knowing what the current draw is on every breaker. Then they are physically positioned so that they equal each other on the opposite leg. e.g. breaker 1 on leg L1 = 5 amps, breaker 2 on leg L2 = 10 amps, breaker 3 on leg L1 = 10 amps, breaker 4 on leg L2 = 5 amps. Total up all amperages on L1 and then on L2 , if they are equal then the panel is balanced with no current on the neutral.
It was probably a 150 amp service back in 1995. Todays services are usually 200 amps.
Without knowing the sq. ft. area of your house and what appliances you have connected and if your hot water tank is electric it is hard to make an assessment. The average household draws about 50 amps so if you are adding another 30 you will be getting close to the limit of the new panel. Ask for an estimate on the 100 amp panel and then on a 200 amp panel. The labor costs should not be much higher for the larger installation of a 200 amp panel just the materials.
Most small old houses only have a 100amp service panel, 4-5 bedroom, very large houses have a 200 amp panel. Now a days,with a small house, you should have a min of 150amp panel installed. To answer you question, there is a main service panel calculation that is used,and goes by the house as to get a service that will pass codes.
Amps measure the current flow so they flow all the time whether it's a minute or an hour, until they are switched off. A solar panel generates watts, that is volts times amps, so if the panel were a 20-volt panel the current would be 2 amps.
An average home nowadays has a 200 amp panel. The dryer and stove use 30 and 40 amps and almost everything else is 15 amps.